Doepfer A-131 VCA exponential
Doepfer A-131 VCA exponential is a voltage controlled amplifier module. It can be amplified or attenuated in an exponential curve, hence it is intended to be used with audio signals.Yet, certain kinds of music or style can make use of the linear curve as well. It is great that the module has 2 separate audio inputs!
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Doepfer A-131 VCA exponential is is a voltage controlled amplifier module. It can be amplified or attenuated in an exponential curve, hence it is intended to be used with audio signals.Yet, certain kinds of music or style can make use of the linear curve as well. It is great that the module has 2 separate audio inputs!
Modules A-130 and Doepfer A-131 VCA exponential provide voltage-controlled amplification. For audio signals, you would normally use the exponential VCA (A-131), and for control voltages, the linear VCA (A-130). It doesn't always have to be that way, though. The amount of amplification the VCAs provide is determined by the voltage at the CV input, and the position of the gain control, which sets the overall gain in the system. The VCA has two audio inputs, each with an attenuator. They are amplified by an amount determined by the combination of the gain and the two CV controls.
For more detailed information please look at the English user's manual
The latest versions of von A-130 and 131 are equipped with the high-end VCA circuits SSM2164/V2164 (A-130) and THAT2159/V2159/SA2159 (A-131). Even they are able to process slowly varying control voltages as they have DC coupled signal in/outputs. These are manufactured since March 2013. Unfortunately it's not possible to upgrade older modules because the new circuitry is totally different.
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